How To Select A Capacitor？Purchase Recommendations

Nowadays, there are many types of capacitors on the electronic component market, and choosing a capacitor has become a knowledge.Today qihe smt pick and place machine sharing some tips for selecting capacitors that you shouldn’t miss! .I have come up with several experiences based on my experience, hoping to better help you .

Choose the appropriate model. Capacitors with different media have different performances, such as capacity range, withstand voltage value, temperature and frequency stability, loss, etc.; there are many different capacitors with the same media. model, so you should choose the appropriate capacitor type according to the performance requirements of your own circuit and the sensitive parameters of the circuit while meeting the basic capacity and withstand voltage requirements.

Reasonably determine the accuracy of the capacitor. In circuits such as bypass, decoupling, and low-frequency coupling, there are generally no strict requirements for the accuracy of the capacitor capacity. When selecting, capacitors with similar or slightly larger capacities can be selected based on the design value.

Determine the rated operating voltage of the capacitor. When the circuit operating voltage is higher than the rated voltage of the capacitor, not only will the leakage current increase sharply, but the capacitor will also be damaged due to heat. When selecting a capacitor, the rated voltage should be higher than the actual working voltage, and enough margin should be left to prevent damage to the capacitor due to voltage fluctuations.Smt pick and place

Try to choose a capacitor with a large insulation resistance. The smaller the insulation resistance, the greater the leakage current of the capacitor. The power loss caused by leakage current will cause the capacitor to heat up, and the increase in its temperature will produce greater leakage current. Such a cycle can easily damage the capacitor, causing the circuit to malfunction or reduce the performance of the circuit. Therefore, when selecting capacitors, capacitors with high insulation resistance should be selected as much as possible, especially under high temperature and high pressure conditions.Smt pick and place

Consider the temperature coefficient and frequency characteristics. The larger the temperature coefficient of a capacitor, the greater the change in its capacity with temperature. Therefore, when selecting capacitors for high-frequency circuits, one must pay attention to the frequency parameters of the capacitor, and during use, be careful not to leave the capacitor’s leads too long to reduce the adverse effects of lead inductance on the circuit.Smt pick and place

That’s it for today’s brief explanation. You can refer to the above methods when choosing capacitors. Learn to select capacitors as an art. I hope everyone can find a suitable capacitor.

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